Metroidvania's are my comfort games and here are some I'm fond of. If you think some of my choices don't count among the sub-genre that's fine, but you are a stone in moving water.
None of the clout or hard ass aesthetic of Symphony of the Night but picks up the slack with fun progression, powers and mashing together Igarashi's best ideas from his other portable castlevania games
Castlevania: Symphony of the Night
Castlevania: Order of Ecclesia
The best Castlevania on the DS right down to having a higher density of thigh on display